Clothesline supporting device



FIG. 1 is a top, front and side perspective view of a clothesline supporting device showing my new design;

FIG. 2 is a view thereof as in FIG. 1, but with the device rotated 90° about a vertical axis;

FIG. 3 is a front perspective view thereof;

FIG. 4 is a top and front perspective view thereof;

FIG. 5 is a side and top perspective view thereof; and,

FIG. 6 is a side and bottom perspective view thereof. 

The ornamental design for a clothesline supporting device, as shown and described. 